Battery pack

ABSTRACT

The present disclosure provides a battery pack and a device comprising the battery pack, the battery pack comprises a double-layer battery module bracket, an upper-layer battery module, a lower-layer battery module and a supporting mechanism; the double-layer battery module bracket comprises an upper plate; a lower fixing member, an upper fixing member and a fastener; the lower fixing member and the upper plate are configured to enclose a lower accommodating space; the upper fixing member and the upper plate being are configured to enclose an upper accommodating space, a lower portion of the fastener exposed from the lower fixing member is fixed on the supporting mechanism; the upper-layer battery module is accommodated in the upper accommodating space and supported on the upper plate; the lower-layer battery module is accommodated in the lower accommodating space; the supporting mechanism supports the lower-layer battery module and the lower fixing member.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority to Chinese patent applicationNo. CN201811629973.6, filed on Dec. 29, 2018, which is incorporatedherein by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of battery, and morespecifically relates to a battery pack and a device.

BACKGROUND

A battery pack generally arranges a battery module in a single layermanner. When the electrical requirements of electrical device (such aselectric vehicles) are relatively high (for example, increasingendurance), the battery pack needs to make full use of a limited heightspace in a Z direction, and if necessary, arranges the battery modulesin a double layer manner. Since the battery modules in double-layer needto be stacked in the Z direction, the supporting stability of thebattery modules in double-layer becomes very important.

SUMMARY

In view of the problem existing in the background, an object of thepresent disclosure is to provide a battery pack and a device comprisingthe battery pack, the battery pack can arrange battery modules in adouble-layer manner and improve the supporting stability of the batterymodules in double-layer.

In order to achieve the above object, in one respect, the presentdisclosure provides a battery pack which comprises a double-layerbattery module bracket, an upper-layer battery module, a lower-layerbattery module and a supporting mechanism. The double-layer batterymodule bracket comprises an upper plate; a lower fixing memberpositioned below the upper plate and supporting the upper plate, thelower fixing member and the upper plate are configured to enclose alower accommodating space; an upper fixing member positioned above thelower fixing member and fixed to the upper plate, the upper fixingmember and the upper plate are configured to enclose an upperaccommodating space, a projection of a lower surface of the upper fixingmember and a projection of an upper surface of the lower fixing memberin a Z direction at least partially overlap; and a fastener passingthrough the upper fixing member, the upper plate and the lower fixingmember along the Z direction within a range in which the projections inthe Z direction overlap, a lower portion of the fastener exposed fromthe lower fixing member is fixed on the supporting mechanism; theupper-layer battery module is accommodated in the upper accommodatingspace and supported on the upper plate; the lower-layer battery moduleis accommodated in the lower accommodating space; the supportingmechanism supports the lower-layer battery module and the lower fixingmember.

In an embodiment, a periphery edge of the upper plate has a first sidealong an X direction; the lower fixing member comprises a first lowerfixing member; the upper fixing member comprises a first upper fixingmember, the first upper fixing member is positioned at the first side ofthe periphery edge of the upper plate, the first upper fixing membercorresponds to the first lower fixing member; the first upper fixingmember is positioned above the first lower fixing member and the firstupper fixing member is staggered along a Y direction with respect to thefirst lower fixing member, such that a projection of a lower surface ofthe first upper fixing member and a projection of an upper surface ofthe first lower fixing member in the Z direction partially overlap, thefastener passes through the first upper fixing member and the firstlower fixing member along the Z direction within a range in which theprojections in the Z direction overlap.

In an embodiment, at the same first side of the periphery edge of theupper plate, the corresponding first upper fixing member and first lowerfixing member are provided on each of left and right sides of an Xdirection center line of the upper plate. Staggering of the first upperfixing member on the left side of the X direction center line of theupper plate with respect to the corresponding first lower fixing memberalong the Y direction is opposite to staggering of the first upperfixing member on the right side of the X direction center line of theupper plate with respect to the corresponding first lower fixing memberalong the Y direction; the corresponding fastener passes through thecorresponding first upper fixing member and first lower fixing memberalong the Z direction within the corresponding range in which theprojections in the Z direction overlap.

In an embodiment, the double-layer battery module bracket furthercomprises a first locking member, the first locking member is arrangedside by side with the corresponding fastener, the first locking memberpasses through the first upper fixing member and the upper plate alongthe Z direction outside the range in which the projections in the Zdirection overlap and fixes the first upper fixing member to the upperplate.

In an embodiment, the double-layer battery module bracket furthercomprises a second locking member, the second locking member is arrangedside by side with the corresponding fastener, the second locking memberpasses through the upper plate and the first lower fixing member alongthe Z direction outside the range in which the projections in the Zdirection overlap and fixes the first upper plate and the first lowerfixing member on the supporting mechanism.

In an embodiment, the first lower fixing member is integrally formedwith a first convex portion, the first convex portion protrudes from abottom portion of the first lower fixing member in a direction away fromthe second locking member; the double-layer battery module bracketfurther comprises a third locking member, the third locking memberpasses through the first convex portion along the Z direction and fixesthe first lower fixing member on the supporting mechanism.

In an embodiment, the upper fixing member further comprises a secondupper fixing member, the second upper fixing member is positioned at thefirst side of the periphery edge of the upper plate along the Xdirection; the lower fixing member comprises a second lower fixingmember, the second upper fixing member is positioned just above thesecond lower fixing member, such that a projection of one of a lowersurface of the second upper fixing member and an upper surface of thesecond lower fixing member in the Z direction falls entirely within aprojection of the other of the lower surface of the second upper fixingmember and the upper surface of the second lower fixing member, thecorresponding fastener passes through the second upper fixing member andthe second lower fixing member along the Z direction in a range in whichthe projections in the Z direction overlap.

In an embodiment, a periphery edge of the upper plate has a second sidealong a Y direction; the double-layer battery module bracket furthercomprises a lower supporting member, the lower supporting member ispositioned at the second side of the periphery edge of the upper platealong the Y direction, an upper side of the lower supporting member inthe Z direction is fixedly connected to the upper plate, a lower side ofthe lower supporting member in the Z direction is fixedly connected tothe supporting mechanism.

In an embodiment, the upper plate comprises a receiving groovepositioned at a periphery edge, a bottom portion of the upper fixingmember is received in the receiving groove.

In an embodiment, the upper plate comprises flanges formed at thereceiving groove and protruding toward each other along a Y direction,the upper fixing member comprises two protruding portions which arepositioned at the bottom portion of the upper fixing member and protrudeoutwardly from both side surfaces of the upper fixing member in the Ydirection, the two protruding portions and a portion of the bottomportion of the upper fixing member between the two protruding portionsare received in the receiving groove, each flanges stops thecorresponding protruding portion from above.

In an embodiment, both the upper-layer battery module and thelower-layer battery module each have a protruding part protrudingoutwardly, a top surface of the upper fixing member attaches to thecorresponding protruding part from below along the Z direction, a bottomsurface of the lower fixing member attaches to the correspondingprotruding part from above along the Z direction, the fastener alsopasses through the protruding part of the upper-layer battery module andthe protruding part of the lower-layer battery module along the Zdirection.

In order to achieve the above object, in another respect, the presentdisclosure provides a device which comprises the battery pack describedabove, and the battery pack is used for supplying power.

The present disclosure has the following beneficial effects: thefastener passes through the upper fixing member, the upper plate and thelower fixing member along the Z direction within the range in which theprojections in the Z direction overlap, and the lower portion of thefastener exposed from the lower fixing member is fixed on the supportingmechanism, the supporting mechanism supports the lower-layer batterymodule and the lower fixing member, the upper-layer battery module issupported on the upper plate, thereby the battery pack of the presentdisclosure may arrange the battery modules in a double-layer manner.Since the fastener passes through the upper fixing member, the upperplate and the lower fixing member and fixed to the supporting mechanismalong the Z direction within the range in which the projections in the Zdirection overlap, the fixing member, the upper plate, the lower fixingmember and the supporting mechanism are integrated, the structuralrigidity is improved, the fastener can effectively resist the impactfrom the X direction and the impact from the Y direction; the fixingmember, the upper plate, the lower fixing member and the supportingmechanism are connected through the fastener, so that the impactreceived is quickly and efficiently dispersed by the transfer of thefastener, thereby the battery pack according to the present disclosurecan improve the stability of the double-layer battery module bracket.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partial perspective view of a battery pack according to thepresent disclosure.

FIG. 2 is a left view of a double-layer battery module bracket assembledwith an upper-layer battery module and a lower-layer battery module ofthe battery pack in FIG. 1.

FIG. 3 is a right view of the double-layer battery module bracketassembled with the upper-layer battery module and the lower-layerbattery module of the battery pack in FIG.

FIG. 4 is a perspective view of a supporting mechanism of the batterypack according to the present disclosure, in which a part of asingle-layer battery module bracket is shown.

FIG. 5 is a simplified view of FIG. 1, in which the upper-layer batterymodule and the lower-layer battery module are removed to clearly showthe double-layer battery module bracket of the battery pack.

FIG. 6 is an assembled perspective view of the double-layer batterymodule bracket of the battery pack according to the present disclosure,in which a heat exchanging plate is removed.

FIG. 7 is a side view of FIG. 6.

FIG. 8 is a top view of FIG. 6.

FIG. 9 is a perspective view of an upper plate of the double-layerbattery module bracket.

Reference numerals in figures are represented as follows:

-   M1 double-layer battery module bracket-   1 upper plate    -   10 periphery edge        -   SX first side        -   SY second side    -   11 receiving groove        -   111 first receiving groove            -   111 a first upper opening            -   111 b first side opening        -   112 second receiving groove            -   112 a second upper opening            -   112 b second side opening    -   12 sheet body    -   13 flange        -   131 first flange        -   132 second flange    -   CX X-direction center line    -   CY Y-direction center line    -   14 heat exchanging plate-   2 lower fixing member    -   21 first lower fixing member        -   210 upper surface        -   211 first convex portion    -   22 second lower fixing member        -   220 upper surface        -   221 second convex portion-   3 upper fixing member    -   31 first upper fixing member        -   310 lower surface        -   311 first protruding portion    -   32 second upper fixing member        -   320 lower surface        -   321 second protruding portion-   4 fastener-   5 first locking member-   6 second locking member-   7 third locking member-   8 fourth locking member-   9 lower supporting member    -   91 protrusion-   RL lower accommodating space-   RU upper accommodating space-   P protruding portion-   M2 upper-layer battery module-   M3 lower-layer battery module-   M4 supporting mechanism    -   M41 bottom plate    -   M42 inner frame    -   M43 outer frame-   M5 single-layer battery module bracket-   100 battery-   101 end plate-   101 a protruding part-   102 tie

DETAILED DESCRIPTION

The drawings illustrate embodiments of the present disclosure, and itwill be understood that the disclosed embodiments are merely examples ofthe present disclosure, which can be implemented in various forms.Therefore, the specific details disclosed herein should not be construedas limitations, but as a basis of claims and as a basis ofrepresentation to instruct an ordinary person of skill in the art toimplement the present disclosure in various ways.

Additionally, expressions indicating directions such as up, down, left,right, front, and back that are used to describe the operation andconfiguration of each part in embodiments are relative and not absolute,and are suitable when each part is in the orientation illustrated by thedrawings; however, when the orientation of each part is changed, thenthese expressions should be interpreted to change corresponding to thechanges in orientation.

FIG. 1 is a partial perspective view of a battery pack according to thepresent disclosure. FIG. 2 is a left view of a double-layer batterymodule bracket assembled with an upper-layer battery module and alower-layer battery module of the battery pack in FIG. 1. FIG. 3 is aright view of the double-layer battery module bracket assembled with theupper-layer battery module and the lower-layer battery module of thebattery pack in FIG. 1. FIG. 4 is a perspective view of a supportingmechanism of the battery pack according to the present disclosure, inwhich a part of a single-layer battery module bracket is shown.

As shown in the figures, a battery pack comprises a double-layer batterymodule bracket M1, an upper-layer battery module M2, a lower-layerbattery module M3 and a supporting mechanism M4. The battery pack mayfurther comprise a single-layer battery module bracket M5. Thedouble-layer battery module bracket M1 comprises an upper plate 1, alower fixing member 2, an upper fixing member 3 and a fastener 4. Aprojection of a lower surface of the upper fixing member 3 and aprojection of an upper surface of the lower fixing member 2 in a Zdirection at least partially overlap. The fastener 4 passes through theupper fixing member 3, the upper plate 1 and the lower fixing member 2along the Z direction within a range in which the projections in the Zdirection overlap, a lower portion of the fastener 4 exposed from thelower fixing member 2 is fixed on the supporting mechanism M4. Morespecifically, both the upper-layer battery module M2 and the lower-layerbattery module M3 each have a protruding part 101 a protrudingoutwardly, a top surface of the upper fixing member 3 attaches to thecorresponding protruding part 101 a from below along the Z direction, abottom surface of the lower fixing member 2 attaches to thecorresponding protruding part 101 a from above along the Z direction;correspondingly, the fastener 4 also passes through the protruding part101 a of the upper-layer battery module M2 and the protruding part 101 aof the lower-layer battery module M3 along the Z direction, thus theupper-layer battery module M2 and the lower-layer battery module M3 arefixed together, therefore it is beneficial to improve the structuralstability of the upper-layer battery module M2 and the lower-layerbattery module M3, in turn ensures the working stability of theupper-layer battery module M2 and the lower-layer battery module M3.Further, in the example shown in the figures, the upper-layer batterymodule M2 and the lower-layer battery module M3 each comprise aplurality of batteries 100 which are arranged, end plates 101 positionedat both ends of the plurality of batteries 100 and a tie 102 tying upthe plurality of batteries 100 and the end plates 101. Correspondingly,the protruding part 101 a is provided on the corresponding end plate101, which helps to improve the integration of components and reducecost. The battery 100 generally comprises a case and an electrodeassembly and an electrolyte received in the case. The electrode assemblycomprises a positive electrode plate, a negative electrode plate and aseparator. The battery 100 may be a can-type (or rigid case) battery, asshown in FIG. 1, correspondingly, the case comprises a cap assembly andan outer case assembled with the cap assembly; or the battery 100 may bea pouch-type (or flexible case) battery (not shown), the case is made ofa packaging film (such as an aluminum plastic film). The double-layerbattery module bracket M1 further comprises a first locking member 5, asecond locking member 6, a third locking member 7 and a fourth lockingmember 8. The double-layer battery module bracket M1 further comprises alower supporting member 9. The supporting mechanism M4 supports thelower-layer battery module M3 and the lower fixing member 2. In theexample of FIG. 4, the supporting mechanism M4 comprises: a bottom plateM41 supporting the lower-layer battery module M3 from below; and aninner frame M42 fixedly connected with the bottom plate M41 andsupporting the lower fixing member 2 from below, the lower portion ofthe fastener 4 is fixed to the inner frame M42. The inner frame M42 maybe an integral structure or comprises a plurality of pieces weldedtogether sequentially. The supporting mechanism M4 further comprises: anouter frame M43 surrounding the inner frame M42 and fixedly connectedwith the inner frame M42. The single-layer battery module bracket M5 isarranged with the supporting mechanism M4 side by side and connectedwith the supporting mechanism M4, the single-layer battery modulebracket M5 supports a battery module in single-layer (not shown).

The double-layer battery module bracket of the battery pack according tothe present disclosure will be described in more detail below.

FIG. 5 is a simplified view of FIG. 1, in which the upper-layer batterymodule and the lower-layer battery module are removed to clearly showthe double-layer battery module bracket of the battery pack. FIG. 6 isan assembled perspective view of the double-layer battery module bracketof the battery pack according to the present disclosure, in which a heatexchanging plate is removed. FIG. 7 is a side view of FIG. 6. FIG. 8 isa top view of FIG. 6. FIG. 9 is a perspective view of an upper plate ofthe double-layer battery module bracket.

A periphery edge 10 of the upper plate 1 has a first side SX along an Xdirection and a second side SY along a Y direction, as shown in FIG. 6and FIG. 8. The upper plate 1 further comprises a receiving groove 11positioned at the periphery edge 10, as shown in FIG. 9. The upper plate1 further comprises a sheet body 12 protruding from the second side SY,as shown in FIG. 6 and FIG. 8. The upper plate 1 further comprisesflanges 13 formed at the receiving groove 11 and protruding toward eachother along the Y direction, as shown in FIG. 9. The upper plate 1further comprises a heat exchanging plate 14, the heat exchanging plate14 exchanges heat with the upper-layer battery module M2. Certainly, theheat exchanging plate 14 shown in the figures can be omitted, and adifferent heat exchange means with additional configuration position andconfiguration mode can be used. A bottom portion of the upper fixingmember 3 is received in the receiving groove 11, which is beneficial tolower the height of the upper fixing member 3, lower the centre ofgravity of the double-layer battery module bracket M1, and improve thestability of the double-layer battery module bracket M1. Specifically,as shown in FIG. 9, the receiving groove 11 comprises a first receivinggroove 111 and a second receiving groove 112. The first receiving groove111 comprises a first upper opening 111 a and a first side opening 111b, the first upper opening 111 a opens upwardly and opens outwardlytoward a side face of the periphery edge 10 to form a C-shape, the firstside opening 111 b opens outwardly toward the side face of the peripheryedge 10. The second receiving groove 112 comprises a second upperopening 112 a and a second side opening 112 b, the second upper opening112 a opens upwardly and opens toward the side face of the peripheryedge 10 to form a C-shape, the second side opening 112 b opens outwardlytoward the side face of the periphery edge 10. The sheet body 12attaches to a top surface of the lower supporting member 9 from aboveand is fixedly connected with the lower supporting member 9. In thefigures, the sheet body 12 is a flat plate, but not limited thereto, forexample the sheet body 12 can be a U-shaped bending plate. The flanges13 of the upper plate 1 comprise first flanges 131 and second flanges132. The first flanges 131 are formed at the first upper opening 111 aand protrude toward each other along the Y direction. The second flanges132 are formed at the second upper opening 112 a and protrude towardeach other along the Y direction.

The lower fixing member 2 is positioned below the upper plate 1 andsupports the upper plate 1, the lower fixing member 2 and the upperplate 1 are configured to enclose a lower accommodating space RL, thelower-layer battery module M3 is accommodated in the lower accommodatingspace RL, as shown in FIG. 5. More specifically, referring to FIG. 6 andFIG. 7, the lower fixing member 2 comprises a first lower fixing member21. The lower fixing member 2 further comprises a second lower fixingmember 22. The first lower fixing member 21 is integrally formed with afirst convex portion 211, the first convex portion 211 protrudes from abottom portion of the first lower fixing member 21 in a direction awayfrom the second locking member 6. The second lower fixing member 22 isintegrally formed with a second convex portion 221, the second convexportion 221 protrudes outwardly from a bottom portion of the secondlower fixing member 22.

The upper fixing member 3 is positioned above the lower fixing member 2and fixed to the upper plate 1, the upper fixing member 3 and the upperplate 1 are configured to enclose an upper accommodating space RU, asshown in FIG. 5. The upper-layer battery module M2 is accommodated inthe upper accommodating space RU and supported on the upper plate 1.

More specifically, referring to FIG. 6 and FIG. 7, the upper fixingmember 3 comprises a first upper fixing member 31. The upper fixingmember 3 further comprises a second upper fixing member 32. Both thefirst upper fixing member 31 and the second upper fixing member 32 canbe made of die casting aluminum alloy, thereby improving the impactresistance of the double-layer battery module bracket M1 while ensuringlightness by utilizing the light weight but high strength property ofthe die casting aluminum alloy.

The first upper fixing member 31 corresponds to the first lower fixingmember 21. In FIG. 6 and FIG. 7, the first upper fixing member 31 ispositioned at the first side SX of the periphery edge 10 of the upperplate 1. The first upper fixing member 31 is positioned above the firstlower fixing member 21 and the first upper fixing member 31 is staggeredalong the Y direction with respect to the first lower fixing member 21,such that a projection of a lower surface 310 of the first upper fixingmember 31 and a projection of an upper surface 210 of the first lowerfixing member 21 in the Z direction partially overlap, the correspondingfastener 4 passes through the first upper fixing member 31 and the firstlower fixing member 21 along the Z direction within a range in which theprojections in the Z direction overlap. The staggering of the firstupper fixing member 31 with respect to the first lower fixing member 21along the Y direction causes a line connecting the centre of gravity ofthe first upper fixing member 31 and the centre of gravity of the firstlower fixing member 21 to be inclined with respect to the Z direction inaddition to providing the range required for the corresponding fastener4 to pass through the first upper fixing member 31 and the first lowerfixing member 21, which helps to disperse the impact in the Z direction(for example, when an electric vehicle travels on bumpy roads), thefirst upper fixing member 31 and the first lower fixing member 21 do notconcentratedly transfer the impact in the Z direction directly throughthe upper plate 1 with respect to each other, but transfer a part of theimpact in the Z direction in the range in which the projections in the Zdirection overlap, and carry out the respective random and dispersetransfer outside the range in which the projections in the Z directionoverlap.

In FIG. 6 and FIG. 7, the second upper fixing member 32 is positioned atthe first side SX of the periphery edge 10 of the upper plate 1 alongthe X direction. The second upper fixing member 32 is positioned justabove the second lower fixing member 22, such that a projection of oneof a lower surface 320 of the second upper fixing member 32 and an uppersurface 220 of the second lower fixing member 22 in the Z directionfalls entirely within a projection of the other of the lower surface 320of the second upper fixing member 32 and the upper surface 220 of thesecond lower fixing member 22 (in other words, compared to theaforementioned partial overlap, this can be referred to as a fulloverlap), the corresponding fastener 4 passes through the second upperfixing member 32 and the second lower fixing member 22 along the Zdirection in a range in which the projections in the Z directionoverlap. By adopting the full overlap manner, the uniform distributionarea of the force in the single Z direction (for example, gravity fromthe upper-layer battery module M2, the impact from the Z direction fromthe external) may be enhanced, and the impact resistance and thecarrying capability in the Z direction may be improved, particularlywhen the second upper fixing member 32 and the second lower fixingmember 22 are provided on a X-direction center line CX.

In FIG. 6 and FIG. 7, at the same first side SX of the periphery edge 10of the upper plate 1, the corresponding first upper fixing member 31 andfirst lower fixing member 21 are provided on each of left and rightsides of the X-direction center line CX of the upper plate 1. Staggeringof the first upper fixing member 31 on the left side of the X-directioncenter line CX of the upper plate 1 with respect to the correspondingfirst lower fixing member 21 along the Y direction is opposite tostaggering of the first upper fixing member 31 on the right side of theX-direction center line CX of the upper plate 1 with respect to thecorresponding first lower fixing member 21 along the Y direction. Thecorresponding fastener 4 passes through the corresponding first upperfixing member 31 and first lower fixing member 21 along the Z directionwithin the corresponding range in which the projections in the Zdirection overlap. The staggerings on the left and right sides of theX-direction center line CX are opposite, which helps to increase thedispersion direction of the aforementioned impact (that is, increasingthe positive and negative directions of the Y direction); additionally,it helps for the symmetrical design.

As shown in FIG. 6, the first upper fixing members 31 and the secondupper fixing members 32 positioned on the opposite first sides SX of theperiphery edge 10 of the upper plate 1 are symmetrical in position andshape with respect to the Y-direction center line CY of the upper plate1. The second upper fixing member 32 and the two first upper fixingmembers 31 positioned on the same first side SX of the periphery edge 10of the upper plate 1 are symmetrical in position and shape with respectto the X-direction center line CX of the upper plate 1. The first upperfixing member 31 is provided at each of the four corners where the Ydirection and the X direction of the periphery edge 10 of the upperplate 1 intersect. The structure shown in FIG. 6 is beneficial to thesymmetrical design.

The upper fixing member 3 comprises two protruding portions P which arepositioned at the bottom portion of the upper fixing member 3 andprotrude outwardly from both side surfaces of the upper fixing member 3in the Y direction, the two protruding portions P and a portion of thebottom portion of the upper fixing member 3 between the two protrudingportions P are received in the receiving groove 11, each flange 13 stopsthe corresponding protruding portion P from above, thereby improving thestructural stability in the Z direction. Specifically, referring to FIG.6 and FIG. 7, the protruding portion P comprises a first protrudingportion 311. The protruding portion P further comprises a secondprotruding portion 321.

The first protruding portions 311 are positioned at a bottom portion ofthe first upper fixing member 31 and respectively protrude outwardlyfrom both side surfaces of the first upper fixing member 31 in the Ydirection, the two first protruding portions 311 and a portion of thebottom portion of the first upper fixing member 31 between the two firstprotruding portion 311 are received in the first receiving groove 111.Further, the two first protruding portions 311 and the portion of thebottom portion of the first upper fixing member 31 between the two firstprotruding portions 311 are received in the first receiving groove 111through the first side opening 111 b, each first flange 131 stops thecorresponding first protruding portion 311 from above, thereby enablingdetachable mounting and positioning. As shown in FIG. 7, a portion abovethe two first protruding portions 311 of the first upper fixing member31 has a trapezoidal shape, thereby facilitating weight reduction andlightness; and also helping to lower the centre of gravity, andimproving the stability of the double-layer battery module bracket M1.

The second protruding portions 321 are positioned at a bottom portion ofthe second upper fixing member 32 and respectively protrude outwardlyfrom opposite side surfaces of the second upper fixing member 32 in theY direction, the two second protruding portions 321 and a portion of thebottom portion of the second upper fixing member 32 between the twosecond protruding portions 321 are received in the second receivinggroove 112. Further, the two second protruding portions 321 and theportion of the bottom portion of the second upper fixing member 32between the two second protruding portions 321 are received in thesecond receiving groove 112 through the second side opening 112 b, eachsecond flange 132 stops the corresponding second protruding portion 321from above, thereby enabling detachable mounting and positioning. Asshown in FIG. 7, a portion above the two second protruding portions 321of the second upper fixing member 32 has a trapezoidal shape, similarly,thereby facilitating weight reduction and lightness; and also helping tolower the centre of gravity, and improving the stability of thedouble-layer battery module bracket M1.

The fastener 4 may be in the form of a bolt and a nut, to facilitatedisassembling and assembling and adjusting of the impact resistancestrength and the fastening force.

Referring to FIG. 6 and FIG. 7 in combination with FIG. 1, the firstlocking member 5 is arranged side by side with the correspondingfastener 4. The first locking member 5 passes through the first upperfixing member 31 and the upper plate 1 along the Z direction outside therange in which the projections in the Z direction overlap and fixes thefirst upper fixing member 31 to the upper plate 1. On the basis of thefastener 4, the first locking member 5 helps to further enhance theimpact resistance of the double-layer battery module bracket M1 andimprove the stability of the first upper fixing member 31. The firstlocking member 5 may be in a form of a bolt and a nut to facilitatedisassembling and assembling and adjusting of the fastening force.

Referring to FIG. 6 and FIG. 7 in combination with FIG. 1, the secondlocking member 6 is arranged side by side with the correspondingfastener 4, the second locking member 6 passes through the upper plate 1and the first lower fixing member 21 along the Z direction outside therange in which the projections in the Z direction overlap and fixes thefirst upper plate 1 and the first lower fixing member 21 on thesupporting mechanism M4. Similarly, on the basis of the fastener 4, thesecond locking member 6 helps to further enhance the impact resistanceof the double-layer battery module bracket M1 and improve the stabilityof the first lower fixing member 21. The second locking member 6 may bein a form of a bolt and a nut to facilitate disassembling and assemblingand adjusting of the fastening force.

Referring to FIG. 6 and FIG. 7 in combination with FIG. 1, the thirdlocking member 7 passes through the first convex portion 211 along the Zdirection and fixes the first lower fixing member 21 on the supportingmechanism M4 (more specifically on the inner frame M42). Similarly, onthe basis of the fastener 4, the third locking member 7 helps to furtherenhance the impact resistance of the double-layer battery module bracketM1 and improve the stability of the first lower fixing member 21,especially when the third locking member 7 is used together with thesecond locking member 6. Further, as shown in FIG. 1, the third lockingmember 7 also passes through the protruding part 101 a of thelower-layer battery module M3, thereby further improving the stabilityof the lower-layer battery module M3 on the basis that the correspondingfastener 4 passes through the protruding part 101 a of the lower-layerbattery module M3. The third locking member 7 may be in a form of a boltand a nut to facilitate disassembling and assembling and adjusting ofthe fastening force.

Referring to FIG. 6 and FIG. 7 in combination with FIG. 1, the fourthlocking member 8 passes through the second convex portion 221 of thesecond lower fixing member 22 along the Z direction and fixes the secondlower fixing member 22 on the supporting mechanism M4 (more specificallyon the inner frame M42). Similarly, on the basis of the fastener 4, thefourth locking member 8 helps to further enhance the impact resistanceof the double-layer battery module bracket M1 and improve the stabilityof the second lower fixing member 22. The fourth locking member 8 may bein a form of a bolt and a nut to facilitate disassembling and assemblingand adjusting of the fastening force.

Referring to FIG. 6 and FIG. 8, the lower supporting member 9 ispositioned at the second side SY of the periphery edge 10 of the upperplate 1 along the Y direction. An upper side of the lower supportingmember 9 in the Z direction is fixedly connected to the upper plate 1(specifically to the sheet body 12), a lower side of the lowersupporting member 9 in the Z direction is fixedly connected to thesupporting mechanism M4 (more specifically to the inner frame M42). Theconfiguration of the lower supporting member 9 helps to enhance theresistance to the impact in the Y direction. The lower supportingmembers 9 positioned on the opposite second sides SY of the peripheryedge 10 of the upper plate 1 are symmetrical in position and shape withrespect to the X-direction center line CX of the upper plate 1.Referring to FIG. 1, the batteries 100 of the upper-layer battery moduleM2 are arranged along the X direction, and the upper plate 1 would bedeflected downwardly at the Y-direction center line CY due to thearranged batteries 100, when the lower supporting members 9 arepositioned on the Y-direction center line CY, the lower supportingmembers 9 can provide sufficient support to avoid the downwarddeflection of the upper plate 1, thereby improving the positionalstability of the upper-layer battery module M2 and improving thestructural stability of the double-layer battery module bracket M1. Thelower side of the lower supporting member 9 in the Z direction hasprotrusions 91 protruding outwardly from opposite side surfaces of thelower supporting member 9 in the X direction, each protrusion 91attaches to the supporting mechanism M4 (more specifically the innerframe M42) from above and is fixedly connected (for example by screw oradhesive) with the supporting mechanism M4 together, the protrusion 91may increase a contact area on the supporting mechanism M4, and enhancethe supporting stability of the lower supporting member 9 to the upperplate 1. The lower supporting member 9 may be aluminum alloy extrusionprofile, which not only can attain lightness, but also can guarantee thesupporting strength and the impact resistance and torsion resistance.

In the battery pack according to the present disclosure, the fastener 4passes through the upper fixing member 3, the upper plate 1 and thelower fixing member 2 along the Z direction within the range in whichthe projections in the Z direction overlap, and the lower portion of thefastener 4 exposed from the lower fixing member 2 is fixed on thesupporting mechanism M4, the supporting mechanism M4 supports thelower-layer battery module M3 and the lower fixing member 2, theupper-layer battery module M2 is supported on the upper plate 1, therebythe battery pack of the present disclosure may arrange the batterymodules in a double-layer manner. Since the fastener 4 passes throughthe upper fixing member 3, the upper plate 1 and the lower fixing member2 and fixed to the supporting mechanism M4 along the Z direction withinthe range in which the projections in the Z direction overlap, thefixing member 3, the upper plate 1, the lower fixing member 2 and thesupporting mechanism M4 are integrated, the structural rigidity isimproved, the fastener 4 can effectively resist the impact from the Xdirection and the impact from the Y direction; the fixing member 3, theupper plate 1, the lower fixing member 2 and the supporting mechanism M4are connected through the fastener 4, so that the impact received isquickly and efficiently dispersed by the transfer of the fastener 4,thereby the battery pack according to the present disclosure can improvethe stability of the double-layer battery module bracket M1.

The above detailed description describes various exemplary embodiments,but is not intended to be limited to the specifically disclosedcombinations. Accordingly, the various features disclosed herein can becombined together to form a plurality of additional combinations thatare not shown for the sake of clarity.

1. A battery pack, comprising a double-layer battery module bracket, anupper-layer battery module, a lower-layer battery module and asupporting mechanism; the double-layer battery module bracketcomprising: an upper plate; a lower fixing member positioned below theupper plate and supporting the upper plate, the lower fixing member andthe upper plate being configured to enclose a lower accommodating space;an upper fixing member positioned above the lower fixing member andfixed to the upper plate, the upper fixing member and the upper platebeing configured to enclose an upper accommodating space, a projectionof a lower surface of the upper fixing member and a projection of anupper surface of the lower fixing member in a Z direction at leastpartially overlapping; and a fastener passing through the upper fixingmember, the upper plate and the lower fixing member along the Zdirection within a range in which the projections in the Z directionoverlap, a lower portion of the fastener exposed from the lower fixingmember being fixed on the supporting mechanism; the upper-layer batterymodule being accommodated in the upper accommodating space and supportedon the upper plate; the lower-layer battery module being accommodated inthe lower accommodating space; the supporting mechanism supporting thelower-layer battery module and the lower fixing member.
 2. The batterypack according to claim 1, wherein a periphery edge of the upper platehas a first side along an X direction; the lower fixing member comprisesa first lower fixing member; the upper fixing member comprises a firstupper fixing member, the first upper fixing member is positioned at thefirst side of the periphery edge of the upper plate, the first upperfixing member corresponds to the first lower fixing member; the firstupper fixing member is positioned above the first lower fixing memberand the first upper fixing member is staggered along a Y direction withrespect to the first lower fixing member, such that a projection of alower surface of the first upper fixing member and a projection of anupper surface of the first lower fixing member in the Z directionpartially overlap, the fastener passes through the first upper fixingmember and the first lower fixing member along the Z direction within arange in which the projections in the Z direction overlap.
 3. Thebattery pack according to claim 2, wherein at the same first side of theperiphery edge of the upper plate, the corresponding first upper fixingmember and first lower fixing member are provided on each of left andright sides of an X direction center line of the upper plate; staggeringof the first upper fixing member on the left side of the X directioncenter line of the upper plate with respect to the corresponding firstlower fixing member along the Y direction is opposite to staggering ofthe first upper fixing member on the right side of the X directioncenter line of the upper plate with respect to the corresponding firstlower fixing member along the Y direction; the corresponding fastenerpasses through the corresponding first upper fixing member and firstlower fixing member along the Z direction within the corresponding rangein which the projections in the Z direction overlap.
 4. The battery packaccording to claim 2, wherein the double-layer battery module bracketfurther comprises a first locking member, the first locking member isarranged side by side with the corresponding fastener, the first lockingmember passes through the first upper fixing member and the upper platealong the Z direction outside the range in which the projections in theZ direction overlap and fixes the first upper fixing member to the upperplate.
 5. The battery pack according to claim 2, wherein thedouble-layer battery module bracket further comprises a second lockingmember, the second locking member is arranged side by side with thecorresponding fastener, the second locking member passes through theupper plate and the first lower fixing member along the Z directionoutside the range in which the projections in the Z direction overlapand fixes the first upper plate and the first lower fixing member on thesupporting mechanism.
 6. The battery pack according to claim 5, whereinthe first lower fixing member is integrally formed with a first convexportion, the first convex portion protrudes from a bottom portion of thefirst lower fixing member in a direction away from the second lockingmember; the double-layer battery module bracket further comprises athird locking member, the third locking member passes through the firstconvex portion along the Z direction and fixes the first lower fixingmember on the supporting mechanism.
 7. The battery pack according toclaim 3, wherein the upper fixing member further comprises a secondupper fixing member, the second upper fixing member is positioned at thefirst side of the periphery edge of the upper plate along the Xdirection; the lower fixing member comprises a second lower fixingmember, the second upper fixing member is positioned just above thesecond lower fixing member, such that a projection of one of a lowersurface of the second upper fixing member and an upper surface of thesecond lower fixing member in the Z direction falls entirely within aprojection of the other of the lower surface of the second upper fixingmember and the upper surface of the second lower fixing member, thecorresponding fastener passes through the second upper fixing member andthe second lower fixing member along the Z direction in a range in whichthe projections in the Z direction overlap.
 8. The battery packaccording to claim 1, wherein a periphery edge of the upper plate has asecond side along a Y direction; the double-layer battery module bracketfurther comprises a lower supporting member, the lower supporting memberis positioned at the second side of the periphery edge of the upperplate along the Y direction, an upper side of the lower supportingmember in the Z direction is fixedly connected to the upper plate, alower side of the lower supporting member in the Z direction is fixedlyconnected to the supporting mechanism.
 9. The battery pack according toclaim 1, wherein the upper plate comprises a receiving groove positionedat a periphery edge, a bottom portion of the upper fixing member isreceived in the receiving groove.
 10. The battery pack according toclaim 9, wherein the upper plate comprises flanges formed at thereceiving groove and protruding toward each other along a Y direction,the upper fixing member comprises two protruding portions which arepositioned at the bottom portion of the upper fixing member and protrudeoutwardly from both side surfaces of the upper fixing member in the Ydirection, the two protruding portions and a portion of the bottomportion of the upper fixing member between the two protruding portionsare received in the receiving groove, each flanges stops thecorresponding protruding portion from above.
 11. The battery packaccording to claim 1, wherein both the upper-layer battery module andthe lower-layer battery module each have a protruding part protrudingoutwardly, a top surface of the upper fixing member attaches to thecorresponding protruding part from below along the Z direction, a bottomsurface of the lower fixing member attaches to the correspondingprotruding part from above along the Z direction, the fastener alsopasses through the protruding part of the upper-layer battery module andthe protruding part of the lower-layer battery module along the Zdirection.
 12. A device, comprising a battery pack, wherein the batterypack is the battery pack according to claim 1, and the battery pack isused for supplying power.